Kate Middleton has once again proven she’s a fashion force to be reckoned with!

When the brunette beauty stepped out in a low-cost dress she wore on an official royal visit Tuesday, it sold out just hours after her appearance!

The Duchess of Cambridge, 30, visited The Art Room charity at the Rose Hill Primary School in Oxford in a $257 brown Orla Kiely Birdie wool jacquard shirt dress, which has since sold out on the website.